Form for constructing concrete silos.



J. T. GANDY. FORM FOR CONSTRUCTING CONCRETE SILOS.

APPLICATION HLED DEC. 20,1916. Patented Aug. 21, 1917.

2 SHEETS-SHEET 1.

IYGHHDY'YT" aim/0,13

J. T. GANDY.

FORM FOR CONSTRUCTING CONCRETE SILOS.

APPLICATION FILED DECPZO. I916. v

Patented Aug. 21,-191?.

2 SHEETS-SHEET 2 2' I GHHDY abhor/wag JOHN T. nanny, or MArLnsvILLnnLABai/m, Assmnon or oivn 'r [Inn T HARVEY i i M. NIX, 0F IVIAPLESVILLE, ALABAMA.

roan non cons'rnncrrne concnnrn sILos.

1,237,774, 1 Specification of Letters Patent. *Pfmtenfigdjkt g; 21 1917 Application filed. hecember 20, 1916. snn No 138,005. f if f f f v To all whomit may concern 7 Be it known that I, JOHN T. CANDY, a citizen of the United States, residing at Maplesville, in the county of Chilton, State of Alabama, have'invented a new and useful Form for Constructing Concrete Silos; and

I do hereby declare the" following to be a full, clear,and exact description of the in vention, such as will enable others skilled in the art to which itappertains to make and object to provide a device of this character sults Y as the heavy whichembodies novel features of construction whereby a concrete silo can be quickly and inexpensively constructed without the use of skilled labor.

Further objects of the invention are to provide a form for making concrete silos "which is comparatively simple and inexpensive in its construction, which can be handled with comparative ease, which forms the silo walls in one reinforced monolithic structure, andwhich will give the same re and cumbersome solid metal forms. e i

With these and other objects in view, the invention "consists in certain novel combinations and arrangements of the parts as will more fully appearas the description proceeds, the novel features thereofbeing pointed out in the appended claims.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in

which 1 Figure 1 is a top plan view of a form for building silos, said form being constructed in accordance with the invention and a suitable arrangement of scafiolding being shown within the silo.

v Fig. 2 is a vertical sectional view through the same.

Fig. 3 is a side elevation thereof.

Fig. 4 is a transverse sectional View through a portion of a silo which has'been .jc onstructed bythe use of the forms.

Fig. 5 is a vertical sectional view through one side of the base of the silo. y

Fig. 6 is a similar view, showing one of the door openings.

. Fig. 7 is a horizontal sectional view 'througha portion of one of the segmental elements of the form.

Corresponding and like parts are referred to in the following descriptionand indicated in all the views of the drawings bylthe same reference characters.

In carrylng out the invelitlon a pair of similar and interchangeable annular molds are provided, said molds being designed to be superposed upon each other and each including an inner wall A and a spaced outer.

wall B. The outer wall Bvof each circular mold is formed of a series of interchangeable segmental sections 1, said sections being provided at the upper and loweredges thereof with outstanding reinforcing flangesfg which are adapted to be engaged by clampmg bands 3 to draw the segmental sections together, and hold them rigidly in operative POS1tlOIl. These outstanding flange members 2 are preferably formed of wood, and metal seats lare applied at intervals to the edges thereof to provide bearings for. the bands 3, said seats having outstanding arms or hooks 5 at the lower ends thereof for the support of the bands 3 before the latter are tightened.

The extremities of each band 3 are shown as provided with angular heads 6 which are respectively engaged by the right and left hand threaded-ends of a clamping boltf 7 that after the clamping bolt has been placed in positionthe ends of the band 3 can be With this construction it will be obvious forcibly drawn together and the several segmental sections 1 forming the outer wall B of the circular mold element thereby held securely inproper position. The inner face of each of the sections 1' is provided witha sheet metal lining 8, said lining beingjsecured'to a wood backing 9 which maybe conveniently formed of vertically disposedfi tongue and groove strips connecting the re inforcing flanges 2,as indicated quite clearly by Fig. 7. Any suitableffastening means such as the nails 10 may be employed for securing the lining 8 to the wooden backing 9, and at one side of each of the segmental sections the sheet metal lining 8 terminates in a tongue or extension 11 which is adapted to overlapthesheet metal lining of the next adjacent [segmental section when the secsimilar and interchangeable segmental sections 12, each of the sectlons lncludlng an U per. and lowe nwer ly t ndi g r in.-

forcmg flange 13, sald flangesbemg connect ed by the wooden backing or sheathing 14 to which the sheet metal lining 15 is applied. As in the previous instance, the sheet metal lining of. each of the segmental sections is provided at one end thereof with an extension or tongue 16 which is adapted to overlap the lining of thenext ad acent segmental section to cover up orbridge over any spacewhichmight'otherwise exist betweenthe abutting ends of thesegmental sections when they are assembled in operative position .The extension 16 of one. of thesegmental sectrons lssomewhat longer than the other eXtensions, in order tobridge re W de Spa o g p etw the emental' meld sections. After the segmental fsectionsg l2 have been properly positioned,

a wooden wedge element 17 is designed to be-driyen between these two segmental sections for thepurpose of forcing them apart 1 and holding the segmental" sections securely in. @pwa p i .Th an 2 f e menta se is 1 of. theout'er wall and also the. flanges 18 0f 1 "the segmental sections 12' of the. inner wall liete'i'te pesi ieniilspin L sai lp sbe ns within the openings. 18. In constructing a silofjtwo of these splitcircular mold ele' i ma ar emp by ea m ld elem nt in- 'cluding a "sectional outer wall and a sectional ee well-p The me ele e e upe posed uponleach other with the vertlcal ;joints broken and in a staggered relation to each other, the upper flanges of the lower 'moldelement and the lower flanges of the upp m ld ele e tbeins l toge he y n er in h P s i n g Pi .91. openings 18, thereby holding the faces of the mold elements accurately in alinement with ea ch other. Asthe walls of the silo increase in height, the then lowermost annular'mold element is, removed section section and placed upon. the upper mold elemen t." In this manner the walls ofthe silo are molded zone by zcne until thedesired height is reached. Certainlof the outer seg- "inent al sections 1 are provided with openings20 to receiye thebolts 21 which are left with the threaded ends the1-eofe3rojecting from the walls of tliesilo for the purpose of e bl n h ch t 22 5 t be bs qu y placed in position without difliculty, Openings 23 arealso' p'r'oyide'd f r the olts 24 upon which the ladder 25 is; mounted, the

inner ends of the bolts being preferably bent 'angu'larly atI iZ JEF so as to obtain a firm bearing upon the concrete. ladder .25 exit 'glaith ff ll height hei il h Wal outer and workman-like appearance.

of which are indicated at 26, and is arranged at one side of the door openings 27. The ladder may be. of any, .conventionah construction, and the chute 23 may also be formed of any suitable material, said chute being arranged to span the-door openings 27 and the ladder 25, and the edges thereof being secured to-the silo walls 26 by means of the bolt/s21.

In erecting a silo with the present mold, a suitable excavation is made and the concrete floor 28 and annular foundation 29 placed in position, the fioor 28 preferably sloping toward the center of the silo, and the foundation29 being of a suitable width and depth to provide the necessary footing for the walls of the silo which it is intended to erect. One of the circular mold elements is next assembled upon the foundation 29, being preferably permitted to rest upon small blocks or strips 30 which can be withdrawn preparatory to removing the mold element, sectibn by section, after the first zone of the wall has been completed. The second annularmold element is superposed. upon the first annular'mcld. element, as indicated by Fig. 2, the outerwalls B, and inner walls A of the mold elements being held the proper distance apart by spacing strips 31 which are inserted inposition between the same andremoved as the filling. in of the molds progresses It will be understood thatplastic concrete of the. proper mixture and cons stency is filled in the space between the inner walls of, the mold sections, said concrete being preferably lightly tamped in order to force it tightly against the sides of the mold. Owing to the fact that thefaces of the mold elements are lined with sheetmetal, the concrete wallv will. have a smooth surface and present a finished and Vllhen the uppermost mold section has been filled, with ,concrete an d the concretewithin the lowermost .mold section has set sufficiently, the

positioning pins 19 are ,withdrawn, the bands 3 and wedges 17 of the lowenmold sectionrcmoved, and the said lower mold elen' ent taken out of position section by section. The faces of all of the sections, are then properly cleansed and assembled in position upon the previouslyupper mold element. The segmental sections containing the bolt openings 20 and 23 are first placed in position in order that the vertical rows of bolts 21 and. 2 1 may be in accurate. alinement, and after the segmental sectionshave all been assembled the clamping bands 8, and wedge blocks 17 are placed in positioinand the positioning pins 19 inserted through corresponding openings of the flanges.

For convenience in handling. the ,segl nental sections of the annular mold elements. a scaffolding is erected at the center ofythe silo. This scaffolding is shown as including a central iiipright 32 and an annular series of uprights 33, said uprights being connectedby the diagonal brace members 34 and also at proper intervals by horizontal strips 35, thereby providing a perfectly rigid construction. These horizontal strips 35 provide supports for the platform boards 36 upon which the operator or operators may stand. After the silo wall has reached such a height thatthe segmental sect ons .of the mold elements can not be manipulated from the ground, tools 37 are em ployed, saidtools being formed with hooked lower ends 37". As the positioning pins 19 are removed, one bolt isloosely inserted in position for supportingeach of the lower segmental mold sections. These lower sections are permitted to hang by the bolts until the workmen are ready to raise the same. The upper flange of each segmental section is then engaged by the hooked ends door forms 38. These door forms have an sition.

annular formation, being preferably con structed of sheet metal, and flaring toward the outer edges thereof, said outer edges being provided with inturned stiffening flanges 39. In the present instance the door forms or frames are substantially hexagonal in shape, the vertical sides thereof being elongated in order to provide a vertically elongated door opening. A frame 40 fits tightly against the inner edge of each door form 38 and projects outwardly beyond the periphery thereof in order to provide an undercut or rabbeted portion 27* at the inner edge of each door opening 27. These plates 40 are shown as provided with books 41 which engage eyes 42 on the flanges 39 of the door forms, thereby providing a means for holding the plate securely in po- These door forms 38 are properly positioned between the outer and inner walls of the annular mold elements at those places where it is desired to provide door openings in the silo wall. Owing to the fact that the edges of the inner plate 40 project outwardly beyond the periphery of the door frame or form 38, the inner edges of the door openings 27 will be rabbeted, as indicated by 27. The silo doors 43 (see Fig. 4) are fitted within these rabbeted edges 27 of the door openingsand provided with bolts 44 which pass through transverse strips 45 and are capped by the nuts 46. The strips 45 span the door openings so that by tightments upon each other.

ening the nuts 45 the doors 43 can be tightly clamped in position. i 1

In constructing the silo wall annularv wire reinforcements 47 are embedded at proper vertical intervals within the concrete, and one or more annular seriesof vertical reinforcing wires 48 are embedded in each zone of the wall as it is formed, the lower ends of the vertical wires 48 of each series slightly overlapping the upper ends of the col-re sponding wires of the lower series. It will also be observed that horizontal reinforcing rods 49 are embedded in the concrete wall above and below each of the door openings '27. -With this construction it will be obvious that a strong and thoroughly reinforced wall will be erected, and the wall can be carried up to the desired height by successively superposing the annularmold ele- After the wall has been completedythe ladder 25 is applied to the projecting ends of the bolts 24" so as to extend the full height of the silo on one side ofthe door openings 27, while the chute or shield 22 is secured in position by the projecting ends of the bolts 21, said chute projecting outwardly from the wall and spannin the door openings 27 and ladder 2'5.

aving thus described the invention, what I claim as new and desire to secure by Let ters Patent, is

1. A form for erecting concrete silo walls 7 including a pair of interchangeable superposed annular mold elements, each mold element including an inner wall and an outer wall and the walls being formed in segmental sections and having upper and lower reinforcing flanges, seats applied to the reinforcing flanges of the outer walls, clamping bands extending around the flanges and engaging the seats, arms projecting outwardly from the lower ends of the seats forsupporting the clamping bands, means for looking the segmental sections of the inner walls together, and means for detachably connect ing the adjacent flanges of the superposed annular mold elements to hold the mold elements in operative position. a

2. A form for erecting concrete silo walls including a pair of interchangeable superposed annular mold elements, each mold element including an inner wall and an outer wall and the walls being formed in segmental sections,wedge members inserted between adj acent segmental sections of the inner walls, sheet metal linings applied to the faces of the segmental wall sections and provided at one end of each section with an extension to overlap the next section, means for locking'the segmental, sections of the outer walls together, and means for detachably connect ing the superposed mold, elements to hold.

them in proper relative position.

3'. A form for erecting concrete silo walls, including a pair of interchangeable superposedannular-mold elements, each mold ele ment lncludlng an innerwall and; an outer Wall and,said.,walls being formed ,in segmental sections, andrhaving upperand lower reinforcing flanges, clamplngbandsn extending around the reinforcing flanges of the ontenwalls, arms for supporting the clamping bandst wedgemembers inserted between the sectionsofi-thei inner Walls, sheet metal linings applied to the faces of the.. segmental Wall sections and proigided with end eXten. sions adapted to oyerlap the adjacentwall section, and means f rdetaQhabIyconnecting he ,ediacen afi nges oft-thev upe pose mold elements :to hold the moldeljements in v i operative position.

l. A form for erecting concrete silo walls includingspaced outer andinnenwalls, a

projectingjbeyond the edges of the door form so as to leavea rabbeted door opening in thesilowall.

5. A; fornt for erecting concrete silo walls,

includi11g spaced, onterand inner walls a skeleton door form inserted, between the onter. and inner vwalls and having. inwardly extending flanges at the front thereof, an

ofl'set plate fitted l'eniovably against the back of the door form and projectingheyond In testimony, whereof I- have signed my e name to this specification. in the presence of two subscribing witnesses.

JOHN T. GANDY.

' Witnesses:

J. C. Mnnonnn'r, L. LANCASTER.

. qop i e s of, pgt e nt inay he,ohtejngd zfor five cents each, byaddressing the fqommissioner of Patents. 

